How to Make My Grandmother's Amazing Blueberry…

Ingredients

• 1 ½ cups (350g) active sourdough starter, at room temperature
• 2 cups (240g) all-purpose flour
• 1 cup (120g) whole wheat flour
• 1 cup (240ml) lukewarm water
• 1 tablespoon (12g) salt
• 1 cup (150g) fresh blueberries (or frozen, but thawed)
• 2 tablespoons (25g) granulated sugar (optional, to enhance sweetness)
• Zest of 1 lemon (optional, for additional flavor)